Tetrahedral Ceramic Abrasive Particles for Consistent Grinding
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Solution Overview
Problem
Existing bonded abrasive articles face issues with inconsistent abrasive particle orientation due to manufacturing techniques, leading to erratic and degraded abrading performance, as they often lack a high degree of symmetry in their shape and size.
Innovation Solution
The development of ceramic shaped abrasive particles with four major sides joined by six common edges, where each side contacts three others, and the common edges have lengths within +/-20 percent of a nominal length, providing tetrahedral symmetry and reducing orientation-related performance issues. These particles are used in abrasive articles, such as grinding wheels and cut-off wheels, with a binder and optional reinforcing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional manufacturing techniques are used for abrasive particles, then production is simpler and faster, but the particles lack consistent symmetry leading to erratic abrading performance
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing a specific symmetric shape (tetrahedral with four major sides and six common edges) that eliminates random orientation issues. This controlled symmetry ensures consistent abrading performance regardless of particle orientation in the abrasive article.
Solution Approach 2:
The patent changes the geometric parameters of abrasive particles by specifying precise dimensional relationships (six common edges with lengths within +/-20 percent of a nominal length, four major sides with specific contact relationships). This parameter control transforms irregular particles into consistently shaped particles that perform reliably.
2Reliability
If abrasive particles have high symmetry with specific geometric constraints, then abrading performance consistency improves, but manufacturing complexity increases
Solution Approach 1:
The patent segments the complex shape control into manageable geometric features: four major sides, six common edges, specific vertex configurations, and defined contact relationships. This segmentation makes the manufacturing process more controllable while achieving the desired symmetry.
Solution Approach 2:
The patent defines specific parameter ranges (edge lengths within +/-20 percent of nominal, four major sides with specific contact relationships) that balance manufacturing feasibility with performance consistency. These parameter specifications provide clear manufacturing targets without requiring excessive precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ceramic shaped abrasive particles enhance the consistency and effectiveness of abrading processes by minimizing orientation-dependent performance variations, resulting in improved grinding and cutting characteristics while maintaining low operating temperatures to prevent thermal damage to workpieces.
Implementation Method 1
drying the ceramic precursor dispersion
Implementation Method 2
sintering the calcined ceramic shaped abrasive particle precursor
Data Source
Figure 1~2
Figure 3A~3E
AI summary
Ceramic shaped abrasive particles have four major sides joined by six common edges. Each one of the four major sides contacts three other of the four major sides. The six common edges have substantially the same length. Methods of making the ceramic shaped particle are disclosed. The ceramic shaped abrasive particles are useful for abrading a surface of a workpiece. An abrasive article includes the ceramic shaped abrasive particles retained in a binder.